Search

Semaphore is a way to signal the alphabet using two flags. You might want to send a message that contains more than just letters. How many other symbols could you send using this code?

In this short problem, try to find the location of the roots of some unusual functions by finding where they change sign.

Use the interactivity to find out how many quarter turns the man must rotate through to look like each of the pictures.

Can you fit the tangram pieces into the outlines of the convex shapes?

How many six digit numbers are there which DO NOT contain a 5?

Here are two kinds of spirals for you to explore. What do you notice?

Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?

On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?

What could each of the children buy in the sweet shop?

However did we manage before calculators? Is there an efficient way to do a square root if you have to do the work yourself?